<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
    <title></title>
</head>
<body>
<div class="container">
    <div class="row">
        <h1>h1. Bootstrap heading
            <small>Secondary text</small>
        </h1>
        <h2>h2. Bootstrap heading
            <small>Secondary text</small>
        </h2>
        <h3>h3. Bootstrap heading
            <small>Secondary text</small>
        </h3>
        <h4>h4. Bootstrap heading
            <small>Secondary text</small>
        </h4>
        <h5>h5. Bootstrap heading
            <small>Secondary text</small>
        </h5>
        <h6>h6. Bootstrap heading
            <small>Secondary text</small>
        </h6>
    </div>
</div>
</body>
</html>